Unstable Naturally Occurring Resistance to Antibiotics in Streptomyces

Naturally occurring ehrlichiosis in Egyptian dogs

Canine ehrlichiosis has emerged as one of the most clinically important tick-borne diseases affecting dogs. Eighty-five naturally infected dogs have been investigated, the most consistent clinical signs recorded were fever, emaciation and lymphoadenopathy, anemia, monocytosis, thrompocytopenia, hypoalbuminemia, elevation in liver enzymes and total bilirubin were the most remarkable changes asso...

Structures and Properties of Naturally Occurring Polyether Antibiotics

Polyether ionophores represent a large group of natural, biologically active substances produced by Streptomyces spp. They are lipid soluble and able to transport metal cations across cell membranes. Several of polyether ionophores are widely used as growth promoters in veterinary. Polyether antibiotics show a broad spectrum of bioactivity ranging from antibacterial, antifungal, antiparasitic, ...

Antibiotics and other naturally occurring hydroxamic acids and hydroxamates.

Naturally occurring hydroxamic acids and hydroxamates are reviewed and classified according to the chemistry of the hydroxamic acid functions. The identity of the Fe(m) trihydroxamate albomycin ö2 with antibiotic Ro 5-2667 is established. TABLE OF CONTENTS 1. Monohydroxamic acids 1.1. Linear hydroxamic acids 1.1.1. Primary hydroxamic acids 1.1.2. Secondary hydroxamic acids 1.2. Cyclic hydroxami...

Coinfection Associated with Naturally Occurring Cryptosporidiosis in Broilers

Contributions to the chemistry of p-lactam antibiotics: I-oxa nuclear analogs of naturally occurring P-lactam antibiotics

Contributions to the chemistry of 0-lactam antibiotics which have been performed for the past fifteen years are summarized. The work comprises syntheses of 1-oxa nuclear analogues of naturally occurring 0-lactam antibiotics in relation with structure-activity relationships. As the result of these studies several promisin compounds of the 1-oxacephem series were found. Among properties and are c...